Driving means for warp stop motions



Aug. 29, 1933. HYDE 1,924,790

DRIVING MEANS FOR WARP STOP MOTIONS Filed March 17, 1955 EyiI.

W/ T/VESJ. INVENTOR. C2 //vTa/vJ,Co5u/e/v. J05: PH H YDE.

ATTORNEY.

Patented Aug. 29, 1933 UNlTEfi STATES DRIVING MEANS FOR WARP STOPMOTIONS Joseph Hyde, Gainesville, Ga, assignor to Draper Corporation,Hopedaie, Mass, a corporation of Maine Application March 17, 1933.

Serial No. 661,365

8 Claims. (01. 139360) The present invention relates to warp stopmotions for looms and more particularly relates to the means for drivingthe or llator arm thereof.

The conventional types of warp stop motions now in use usually includemoving detector members, operated by an oscillator and adapted to bearrested by a fallen drop wire, devices being provided for stopping theloom when movement of the detector members is thus arrested. It has beendifficult to devise satisfactory means for driving the oscillator arm,because of the many factors which must be taken into consideration.Notable among these factors are the remoteness from the warp stop motionof a convenient source of power, the limited space available for drivingconnections, and, in some instances at least, the necessity of providingfor adjustment of the warp stop motion forwardly and rearwardly on theloom.

The more common method of driving the oscillator arm involves the use ofcam on the loom cam shaft, operating a cam follower rod which isconnected to the oscillator arm through the medium of a form of knucklejoint, such as is shown, for example, in the patent to I. W. Noyes, No.1,729,592, dated Sept. 24, 1929 or the patent to H. A. Davis, No.1,687,471, dated Oct. 9, 1928. Such driving means have not provenentirely satisfactory for the reason that they present points subject toexcessive wear, and depend upon relative sliding movement of certain ofthe parts, or lost-motion in others, to compensate for the fact that theoscillator arm and the driving means therefor operate in differentplanes.

Accordingly, it is an object of myinvention to provide, in a warp stopmotion, improved driving means for the oscillator arm thereof, whichdrivin means shall be devoid of parts which might be subject toexcessive wear.

A further object of my invention is to provide a new and improvedoscillator rod for driving the oscillator arm of a warp stop motion,which oscillator rod shall be so constructed as to replace theoscillator rod and the connecting parts, or knuckle joint, of existinwarp stop motions.

Further objects of my nvention will, in part, be hereinafter morespecifically enumerated, or will become obvious as the descriptionproceeds.

The preferred embodiment of my invention is illustrated in theaccompanying drawing to which reference may be had and of which:

Fig. 1 is a view in perspective of the left hand end of a warp stopmotion, and the driving parts, embodying my invention; and

Fig. 2 is a detail view, to a larger scale, of a portion of my improvedoscillator red, the end of the oscillator arm being shown in section.

The warp stop motion which I have chosen to illustrate the applicationof my invention includes drop wires 1 which, upon breakage of the respective supporting warp thread or threads, engage the teeth of detectormembers 2 to arrest tl movement. The detector members 2 are supported.and guided in toothed supporting bars 3 and are moved longitudinally, i.e. widthwise of the loom, by fingers i. The fingers a are reciprocatedby a usual form of oscillator arm 5, through the medium of certainconnections not shown in detail. The particular oscillator arm shownextends in the same general direction as the detector members andoperates in a vertical plane parallel thereto.

When a drop wire 1 arrests movement of a detector member 2, the movementof the oscillator arm will be imparted to one of the levers 6 which willin turn, push downwardly upon a pivoted plate 7 to thereby operate aBowden wire 8 connected to parts, not shown, for stopping the loom.

The warp stop motion is supported by stands, of which only the left handstand 9 is shown. These stands are provided with slots 16 extending atright angles to slots 11 in brackets 12 supported by the loom side (notshown), the slots, together with securing bolts 13, constituting meansfor mounting the stands for adjustment forwardly and rearwardly ortransversely of the loom.

The warp stop motion as thus far described is identical with that shownin the aforementioned Patent 1,687,471, to which reference may be hadfor a more detailed disclosure of the construction and operation of suchmechanism. -It is noted at this time that the warp stop motion itselfapertains to my invention only insofar as it constitutes one element ina combination, and other forms of warp stop motion maybe substituted forthe one herein disclosed.

In certain well-known constructions, including those of the. abovementioned Davis and Noyes patents, the necessary power for operating theoscillator arm of the warp stop motion is derived from a cam on the loomcam. shaft and is transmitted to the oscillator arm by a part known inthe art as an oscillator rod. The embodiment of my invention hereindisclosed includes such a cam 14 mounted on the loom cam shaft 15 andserving to reciprocate, endwise, an oscillator rod indicated generallyat 16. The cam 14 is a double track, face cam identical with that shownin the said Davis patent.- A collar-.17 serves to. retain the oscillatorrod against the cam and, where my invention is employed, may serve tosubstantially limit the movement of oscillator rod to endwisereciprocation and oscillation about the axis of the cam shaft, i. e. tomovement in a vertical plane which intersects the plane of movement ofthe oscillator at approximately a right angle. Prior constructionsrequired a sloppy fit of the oscillator rod between the collar 17 andcam 1%, to compensatefor inherent limitations in the flexibility oi theconnections between the oscillator rod and the oscillator arm.

In the present embodiment of my invention, I form the oscillator rod oftwo separate parts or pieces. rod and embodies a cam follower, in theusual manner. The upper piece 19 includes means for attachment to theoscillator arm. To this end, the piece 19 may be formed of a round ironor steel rod bent laterally as at 20 to project through a slot 21 in theoscillator arm. The bent portion 29 is threaded to receive nuts 22, 22which are located on opposite sides of the oscillator arm and rigidlyclamp the piece 19 thereto. The piece 19 constitutes a form of fixedconnector, for connecting a spring 23 with the oscillator arm. Otherconnectors may be substituted if so desired.

The spring 23 is interposed between the rod 18 and the connector 19 or,in effect, between the rod 18 and the oscillator arm. The spring shownis of the well known coiled variety and has its lower end secured to theupper end of rod 18 as by having its coils engaged in threads formed onthe rod. The upper end of the spring 23 is fixed with respect to theoscillator arm and this result may be accomplished by engaging the coilsof the spring in threads formed on the lower end of connector 19, asshown.

The spring 23 is sufficiently rigid to impart motion from the rod 18 tothe connector 19, and thereby to the oscillator arm, but is yieldablelaterally of the direction of such motion. The physical dimensions ofthe spring necessary to result in the desired mode of operation will, ofcourse, vary with the size and kind of warp stop motion employed, andother factors, but such dimensions are easily determinable regardless ofwhether the spring employed is of the coiled type or otherwise.

It will be apparent that the use of a spring for the purpose indicatedwill permit proper cooperation between the rod 18 and the oscillator armeven though the warp stop motion be adjusted forwardly or rearwardly orlaterally on the loom.

It will likewise be apparent that my improved oscillator rod can besubstituted for existing devices, and will eliminate the knuckle jointsor other parts which may be subject to rapid wear.

I wish to direct attention to the fact that my invention, in at leastone of its respects, is not restricted to the constructions wherein thereciprocating part which activates the oscillator arm is constituted bya reciprocating rod. as 18, but many other forms of reciprocatingpartsmay be employed.

Having disclosed the preferred embodiment of my invention, I claim:

1. A warp stop motion including movable detector r'nembers, meansincluding an oscillator arm for moving said members, a connector rigidlyfixe d to said oscillator arm, a earn, a rod reciprocated endwise bysaid cam and confined to movements in a single plane, and a springhaving one end secured to said rod and its other end secured to saidconnector, said spring being suinciently rigid to impart motion fromsaid rod to said connector but being yieldable laterally of thedirection of said motion.

2. A warp stop motion including movable detector members, meansincluding an oscillator arm for moving said members, a connector rigidlyfixed to said oscillator arm, a cam, a rod re- The lower piece 18 is inthe form of a ciprocated endwise by said cam and confined to movementsin a single plane, and aspring interposed between said connector andsaid rod and constituting the sole connection therebetween, said springbeing sufficiently rigid to impart motion from said rod to saidconnector but being yieldable laterally of the direction of said motion.

3. A warp stop motion including a stand, means for adjustably mountingsaid stand on a loom for forward and rearward adjustment, detectormembers supported by said stand, means including an oscillator arm formoving said members, an endwise reciprocating rod, which rod is confinedto'moveinents in a single plane, and a spring having one end fixed tosaid rod and its other end fixed with respectto said oscillator arm foroperating the latter, said spring being sufficiently rigid to impartmotion from said rod to said oscillator arm but being yieldablelaterally of the 5. A warp stop motion including movable detec- .c

tor members, means including an oscillator arm operating in a givenplane for moving said members, a reciprocating part operating in adiiferent plane, and a spring having one end fixed to said part and itsother end fixed with respect to said oscillator arm for operating thelatter, said spring being sufiiciently rigid to impart motion from saidrod to said oscillator arm but being yieldable laterally of thedirection of said motion.

6. A warp stop motion including movable detector members, meansincluding an oscillator arm for moving said members, a reciprocatingpart, and a coiled spring having one end fixed to said part and itsother end fixed with respect to said oscillator arm for operating thelatter, said spring being SLlfllClSl'ltlY rigid to impart motion fromsaid rod to said oscillator arm but being yieldable laterally of thedirection of said motion.

7. As an article of manufacture, an endwise movable oscillator rod fordriving the oscillator arm of warp stop motions, said oscillator rodbeing formed of separate pieces the lower one of which embodies a camfollower and the upper one of which includes means for attachment to anoscillator arm, the said pieces being connected by a spring which issufiiciently rigid to impart motion from the lower one of said pieces tothe upper one thereof but which is yieldable laterally of the directionof said motion.

8. As an article of manufacture, an endwise movable oscillator rod fordriving the oscillator arm of warp stop motions, said. oscillator rodbeing formed of separate pieces the lower one of which embodies a camfollower and the upper one of which includes means for attachment to anoscillator arm, thesaid pieces being connected by a coiled spring whichis sufiiciently rigid to impart motion from the lower one of said piecesto the upper one thereof but which is yieldable laterally of thedirection of said motion.

JOSEPH HYDE.

